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Photoconductivity Characterization Of Single Walled Carbon Nanotube Phototransistors
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Book Synopsis Photoconductivity Characterization of Single-walled Carbon Nanotube Phototransistors by : Todd Robert Narkis
Download or read book Photoconductivity Characterization of Single-walled Carbon Nanotube Phototransistors written by Todd Robert Narkis and published by . This book was released on 2004 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Optical Characterization of 0.4 Nm Single-walled Carbon Nanotubes by : Kit Yee Cheng
Download or read book The Optical Characterization of 0.4 Nm Single-walled Carbon Nanotubes written by Kit Yee Cheng and published by . This book was released on 2003 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis of Single-walled Carbon Nanotubes and Characterization of Nanotube-based Field-effect Transistors by : Woong Kim
Download or read book Synthesis of Single-walled Carbon Nanotubes and Characterization of Nanotube-based Field-effect Transistors written by Woong Kim and published by . This book was released on 2005 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrical Characterization of Single-walled Carbon Nanotubes by : Derek William Austin
Download or read book Electrical Characterization of Single-walled Carbon Nanotubes written by Derek William Austin and published by . This book was released on 2001 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electronic Characterization of Individual Single-Walled Carbon Nanotubes by : Chi-Yan Wong
Download or read book Electronic Characterization of Individual Single-Walled Carbon Nanotubes written by Chi-Yan Wong and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Electronic Characterization of Individual Single-walled Carbon Nanotubes" by Chi-yan, Wong, 王志仁, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled ELECTRONIC CHARACTERIZATION OF INDIVIDUAL SINGLE-WALLED CARBON NANOTUBES Submitted by Wong Chi Yan for the Degree of Master of Philosophy at The University of Hong Kong in September 2007 The outstanding properties of carbon nanotubes (CNTs) have attracted con- siderable research effort in the last decade. CNTs are quasi-one-dimensional materials which can be used to study fundamental quantum effects of one- dimensional systems. TherehasbeenagreatdealofinterestspecificallyinsemiconductingCNTs, which have shown to be promising candidates as the building blocks for the next-generation electronic applications. Carbon nanotube electronic devices have the potential to replace conventional silicon-based counterparts. How- ever, there are still obstacles that remain with regard to the scientific study or application oriented researches. For example, the growth orientation and the band gaps of individual CNTs are difficult to control. In addition, pronounced low-frequency current fluctuation, 1/f noise, exists. The measured noise levelisevencomparabletothesignallevelundersomecircumstances, therebylimit- ing the application of CNTs in low-signal electronics and the overall reliability of CNT based devices. In this thesis, single-walled CNTs (SWNTs) were chosen as a studying modelduetotheirsimplicityinnature. DifferentmethodsofindividualSWNT fieldeffecttransistor(FET)fabricationmethodswerecompared. Themethods included: (I) Directed growth of ultra long SWNTs on a wafer by CVD using ethanol, and (II) Dispersing the SWNTs fabricated by ordinary CVD, on the wafer with organic solvents. The noise behavior for both fabrication methods were characterized by DAQ and lock-in noise measurement methods. Thereafter, thebasicI-V measurementsoffabricatedSWNTFETdevices were also performed. The hysteresis effect and its time dependent measure- ments in FETs were illustrated. The measurements results suggested that the hysteresis effect in nanotube devices was attributed to the charge traps in the oxide layer of FETs. Finally, the 1/f noise of SWNT FETs was studied. It was shown that the 1/f noise arose from the carrier number fluctuations rather than mobility fluctuations, as a superposition of Lorentzian fluctuation spectra. The corre- -2 sponding Hooge constant was found to be gate dependent and about 10 in thelinearregime. Bycomparingwiththereportedsimulationresultofrandom telegraphsignal(RTS)noiseamplitudeinsubthresholdregime, itwasproposed that such Lorentzian fluctuation spectra were due to the RTS noise, arising from the gate potential fluctuations in the CNT, and the charge exchange be- tween CNT and oxide layer. These potential fluctuations were attributed to trapped charges in the oxide nearby which changed the number of carriers in the CNTs. DOI: 10.5353/th_b3955704 Subjects: Nanotubes Nanostructured materials - Electric properties Transistors
Book Synopsis Electrical Characterization and Device Applications of Individual Singled-wall Carbon Nanotubes by : Ali Javey
Download or read book Electrical Characterization and Device Applications of Individual Singled-wall Carbon Nanotubes written by Ali Javey and published by . This book was released on 2005 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optical Characterization of 0.3nm Single-walled Carbon Nanotubes by : Yiu Yin Tong
Download or read book Optical Characterization of 0.3nm Single-walled Carbon Nanotubes written by Yiu Yin Tong and published by . This book was released on 2007 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Optical Properties of Single-walled Carbon Nanotubes: Separation, Characterization, and Measurement in Suspension by : Richard M. Russo
Download or read book The Optical Properties of Single-walled Carbon Nanotubes: Separation, Characterization, and Measurement in Suspension written by Richard M. Russo and published by . This book was released on 2006 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The one dimensional structure of single-walled carbon nanotubes (SWNTs) gives rise to optical phenomena that differ from bulk materials. This dissertation studies the separation of SWNTs dissolved in aqueous media using surfactant molecules, and the measurement of their intrinsic optical properties including absorption and emission. The SWNTs were separated from the bundled form using mechanical processing techniques such as sonication and centrifugation. A processing study, which isolated the effects of sonication frequency, sonication power, and centrifugation speed, was performed to determine the factors that lead to the best separation. The results of this study suggest that the suspensions are a mixture of individual tubes and small bundles. Prior determinations of intrinsic nanotube properties based on the assumption of isolated nanotubes will have to be revisited. The transient absorption spectrum was measured for the S11 subband region using monochromatic pump excitation at wavelengths corresponding to S22 subband transitions, where the exciting pump fluence was sufficient to create many excitons on a single nanotube. The transient decay kinetics followed a linear dependence that was proportional to 1/ t on a log-log scale with a slope of -0.5, which is consistent with the diffusion limited recombination of excitons in one dimension. This result suggests that the decay of photoexcitations in nanotubes is initially governed by two-body kinetics, which becomes a one-body process only in the long time limit. Our work refutes the one-electron model for the excited state relaxation of nanotubes proposed by others. When the transient decay was studied as a function of the initial exciton population, the diffusion coefficient was found to be a different constant value at each initial population. Local thermalization of the surrounding medium may cause this difference, as thermal relaxation occurs on a time scale that is longer than that of exciton recombination in SWNTs. This work further elucidates the mechanism of excited state relaxation in SWNTs, and advances the understanding of one-dimensional nanostructures.
Book Synopsis Catalytic CVD Generation and Optical Characterization of Single-walled Carbon Nanotubes from Alcohol by : Shigeo Maruyama
Download or read book Catalytic CVD Generation and Optical Characterization of Single-walled Carbon Nanotubes from Alcohol written by Shigeo Maruyama and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photoconductivity of Aligned Carbon Nanotube Fibers by : Ye Liu
Download or read book Photoconductivity of Aligned Carbon Nanotube Fibers written by Ye Liu and published by ProQuest. This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes (CNTs) are of great interest in today's research, and more and more researchers are getting interested in what happens when they interact with photons. While a light of certain intensity (usually a laser beam) shining on a carbon nanotube composition, usually two kinds of physical responses will be observed: photoconductivity and photomechanical actuation. Though photoconductivity of single carbon nanotube and thin CNT bundles has been studied thoroughly, photoconductivity of macro scale carbon nanotube devices is expected to have properties different from a single nanotube or thin nanotube bundles, since an interaction of electrodes and nanotube devices is going to play a significant role in the generation of photoconductivity. A study of photoconductivity of unaligned carbon nanotube films has been conducted by our group previously, which has proved some of our expectation of the differences. However, due to fabrication difficulty and structure fragility, the experiment and results about photoconductivity of aligned carbon nanotube fibers introduced in this master's thesis have never been reported before. This novel study will not only further reveal the differences of photoconductivity between macro scale carbon nanotube devices and a single nanotube, but also prove our expectation of the unique properties of aligned carbon nanotube fibers. In this thesis, the author will describe a fabrication procedure for partially aligned carbon nanotube fibers and the assembly step for the samples, then reason the experimental details. After that, the result will be introduced and labored. For the photocurrent of aligned CNT fibers, a "position effect", a dependency for the frequency of incident light pulse, and a linear photocurrent-intensity curve is observed, which are similar to the responses of unaligned films. But meanwhile, unique properties such as a fast dynamic response, an even faster dynamic response with "flood light exposure", a higher quantum efficiency and a dependency on the polarization of incident light will all be revealed. These results fit in our previous prediction of the electric mechanism of the photoconductivity of aligned CNT fibers, which is based on electron-hole pair generation and subsequent separation by both the built-in voltage at the electrode-fiber contact and the electrical fields induced by external voltage source and incident light. These results have also demonstrated that the molecular desorption mechanism may not be the dominant origin of the photoconductivity, since the dynamic response we observed is much faster than this process. Another contribution of this thesis is that we obtained a relatively large quantum efficiency (~6.4%) using partially aligned carbon nanotube fibers. This demonstrates that carbon nanotubes can be utilized in potential energy conversion devices as photo-detectors or solar cells, which together with the photomechanical applications of CNT structures is suggesting a promising future in research and engineering regarding carbon nanotubes.
Book Synopsis High Frequency Characterization of Single-walled Carbon Nanotubes by : Chinmay Darne
Download or read book High Frequency Characterization of Single-walled Carbon Nanotubes written by Chinmay Darne and published by . This book was released on 2008 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electronic Characterization of Individual Single-walled Carbon Nanotubes by : Chi-yan Wong (Electronic Engineering.)
Download or read book Electronic Characterization of Individual Single-walled Carbon Nanotubes written by Chi-yan Wong (Electronic Engineering.) and published by . This book was released on 2007 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2004 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Probing the Way of Combining Theoretical Calculation with Experimental Characterization on Deposited Single-walled Carbon Nanotube Film by : SHULIN TAN
Download or read book Probing the Way of Combining Theoretical Calculation with Experimental Characterization on Deposited Single-walled Carbon Nanotube Film written by SHULIN TAN and published by . This book was released on 2019 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The carbon nanotube has long been seen as a next-generation semiconductor due to its 1D nanostructure and superior electrical properties. However, the characterization of it remains a challenge due to its ultra small diameter. It is suggested that a combination of theoretical simulations and experimental characterization would be suitable to reduce the time and effort needed to probe the properties of the defect of it. In this thesis, both finite element simulation and multiple characterization techniques, namely Raman Spectroscopy, Raman Imaging, Scanning Electron Microscopy and Atomic Force Microscopy, are performed to probe the effect of misalignment on the properties of deposited carbon nanotubes. The result of finite element simulation shows that the misalignment of nanotubes would lead to a drop in the total current flow through the device and a concentration of electrical current on a single nanotube. Experiments are then set up to probe a way of characterizing this defect. The diameter and bandgap of the carbon nanotube obtained from characterization is also used in the simulation. It is revealed that computer simulation and characterization results could be combined.
Book Synopsis Single-walled Carbon Nanotubes as Near Infrared Fluorescent Sensors by : Hong Jin (Ph. D.)
Download or read book Single-walled Carbon Nanotubes as Near Infrared Fluorescent Sensors written by Hong Jin (Ph. D.) and published by . This book was released on 2010 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: (cont.) The total uptake of both SWNT and Au nanoparticles is maximal at a common radius of 25 nm when scaled using an effective capture dimension for membrane diffusion. The ability to understand and predict the cellular uptake of nanoparticles quantitatively should find utility in designing nanosystems with controlled toxicity, efficacy and functionality. The development of such single molecule detection technologies for ROS motivates their application to many other unexplored signaling pathways both in vitro and in vivo.
Book Synopsis Synthesis and Characterization of Single-walled Carbon Nanotubes by Dual Laser Vaporization by : Mathew Kisten Moodley
Download or read book Synthesis and Characterization of Single-walled Carbon Nanotubes by Dual Laser Vaporization written by Mathew Kisten Moodley and published by . This book was released on 2010 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Materials Nanoarchitectonics by : Katsuhiko Ariga
Download or read book Materials Nanoarchitectonics written by Katsuhiko Ariga and published by John Wiley & Sons. This book was released on 2018-01-15 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unique overview of the manufacture of and applications for materials nanoarchitectonics, placing otherwise hard-to-find information in context. Edited by highly respected researchers from the most renowned materials science institute in Japan, the first part of this volume focuses on the fabrication and characterization of zero to three-dimensional nanomaterials, while the second part presents already existing as well as emerging applications in physics, chemistry, biology, and biomedicine.
